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Re:Show HN: I made an app to draw stickers for iMessage, Dis... by zaik on Tuesday August 31, 2021 @07:41PM (#28374938)
https://xmpp.org/extensions/xep-0449.html

Now we just have to wait until people leave walled gardens like Slack and Discord and start using the Internet standard for IM.

Re:Show HN: I made an app to draw stickers for iMessage, Dis... by dudus on Thursday September 02, 2021 @02:28PM (#28395588)
So it's basically a XML file that defines sticker packs and stickers as png files. No notes on size constraints, image formats, installation, distribution, sharing across apps. Seems like an early stage standard.